/Engine/Plugins/FX/Niagara/Source/Niagara/Public/NiagaraEmptyUAVPool.h
Scoped access for RDG UAVs this is not required when running inside the main dispatch loop but is required for external usage that is outside, i.e. if you are doing some custom dispatch setup
struct FNiagaraEmptyRDGUAVPoolScopedAccess